下面段文中共有10处语言错误，错误涉及一个单词的增加、删除或修改。
增加：在此处加一个漏字符号(∧)，并在其下面写出修改的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在其下面写出修改后的词。
注意：1.每处错误及其修改均仅限一词；
2．只允许修改10处，多者（从十一处起）不计分。
On January 5th, students in our school visited Robot World, which we saw a great diversity of robots. It was amazed to find those robots could do a great number of things just as real people do, included playing chess, playing the piano and draw pictures. Besides, the robots were in different kinds and shapes, which makes us delighted. However, that excited me most was the show given by a group of robots. They danced even if they were dancers on the stage. By visiting Robot World, I have learned a lot of about robots, especially about their functions. The great human wisdom is so powerfully that it makes us feel more comfortable live in the world.